Rotor of electric rotating machine

ABSTRACT

Leakage of a magnetic flux from inside diameter face of claw magnetic poles is reduced to improve output, and deformation and vibration of the claw magnetic poles are reduced.  
     A rotor includes: a rotor coil for generating magnetic flux; a pole core comprised of a first pole core body and a second pole core body that are arranged so as to cover the rotor coil, each being provided with protruding claw magnetic poles  21, 22  engaging with each other; a magnet  31  for reducing leakage of magnetic flux leaking from inside diameter side of the claw magnetic poles  21, 22;  and a magnet-holding member  32  for supporting the magnet  31  on the claw magnetic poles  21, 22.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a rotor structure of an electricrotating machine such as ac generator or electric motor and, moreparticularly, to a magnet that prevents leakage of magnetic flux frominside diameter face of claw magnetic poles and to a structure offitting the magnet.

[0003] 2. Description of the Related Art

[0004] In a conventional rotor structure, rectangular solid magnetspolarized in a direction of reducing leakage of magnetic flux betweensides of adjacent claw magnetic poles are fixed between the clawmagnetic poles facing each other, and holders for reducing centrifugalforce are used to fit these magnets.

[0005] When the magnets for preventing leakage of magnetic flux arefitted to the claw magnetic poles of a rotor core as described above,the claw magnetic poles increase in weight. Therefore, end of each clawmagnetic pole reciprocates toward a rotor coil and a stator due tocentrifugal force caused by rotation of the rotor and magneticattraction between the claw magnetic pole and the stator produced at thetime of power generation.

[0006] As a result, a load is applied to the magnets between the clawmagnetic poles, and this sometimes may cause distortion or breakage ofthe magnets.

[0007] To overcome this, in a conventional rotor, a magnet is fixed toeach claw magnetic pole in such a manner as to cover an innercircumferential face and a side face of the claw magnetic pole.

[0008] In this known construction, spaces are left between the adjacentmagnets.

[0009] As a result, the claw magnetic poles and the magnets reciprocateindependently, therefore any load is not applied to the magnets, and itis possible to prevent the magnets from breakage (for example, see theJapanese Patent Publication (unexamined) No. 1999/136913, pages 3 and4).

[0010] In another conventional rotor, each claw magnetic pole isprovided with two ferrite magnets on both side faces of each clawmagnetic pole, and these magnets are polarized so as to reduce leakageof magnetic flux between the claw magnetic poles.

[0011] These magnets are supported on the claw magnetic poles, with aslant so as to spread their outer circumference sides toward each other,by magnet-holding members for absorbing centrifugal force that acts onthe mentioned magnets when the rotor is rotating through deformation ofthe magnet-holding members themselves. Thus, the magnets are soconstructed as to withstand centrifugal force (for example, see theJapanese Patent Publication (unexamined) No. 2001/86715, page 6).

[0012] Generally, in order to improve output of a rotor of an electricrotating machine, one method is to reduce an air gap between rotor andstator, and another is to prevent leakage of magnetic flux from magneticpoles.

[0013] The easiest method to prevent leakage of magnetic flux from themagnetic poles is fitting a permanent magnet to a portion where magneticflux leaks, i.e., between the magnetic poles or on the inside diameterface of the claw magnetic poles.

[0014] To fix the permanent magnet, it is necessary to use anymagnet-holding member, and in a case where the magnets are fittedbetween the claw magnetic poles, centrifugal force acts on the magnetitself. Therefore, it is necessary that the magnet-holding member beconstructed so as to withstand centrifugal force to prevent the magnetfrom getting out.

[0015] In the mentioned prior art, structure of the magnet-holdingmember is strong enough to withstand centrifugal force by employing aspecial configuration.

[0016] However, a problem exists in this prior art that themagnet-holding member itself increases in weight thereby increasingweight of the claw magnetic poles as a whole, eventually resulting indeformation of the claw magnetic poles.

[0017] Another problem exists in prior art that it is essential toenlarge the air gap because of preventing the electric rotating machinefrom breakage occurring at the time the claw magnetic poles come incontact with the stator.

SUMMARY OF THE INVENTION

[0018] To improve output of the electric rotating machine easily, it maybe an idea to fit any magnet on the inside diameter face therebypreventing leakage of magnetic flux from the inside diameter side of theclaw magnetic poles.

[0019] In this method, it is certain that acceleration of rotation ofthe magnets generates centrifugal force, but the claw magnetic polesreceive the centrifugal force. Thus, the magnet-holding members forfixing the magnet to the inside diameter face can be simpler and lighterthan the holding member employed for fixing the magnet between the clawmagnetic poles.

[0020] As a result, it is possible to minimize the increase in weight ofthe claw magnetic poles caused by fitting the magnet, and consequently,it is possible to reduce the air gap.

[0021] The magnet fitted on the inside diameter face of the clawmagnetic poles is fixed in the circumferential direction by the clawmagnetic poles and, at the same time, any position regulating part isprovided in axial direction in order to prevent the magnet from gettingout in axial direction thereby improving assembling efficiency.

[0022] An object of the present invention is to reduce deformationcaused by centrifugal force as well as prevent movement in axialdirection by fitting a magnet on the inside diameter side of the clawmagnetic poles and designing fitting structure of the magnet.

[0023] A rotor of an electric rotating machine according to claim 1 ofthe invention includes: a rotor coil for generating magnetic flux byapplying a current; and a pole core comprised of a first pole core bodyand a second pole core body that are arranged so as to cover thementioned rotor coil, each being provided with claw-shaped claw magneticpoles engaging with each other. In this rotor, a magnet assemblycomposed of a magnet for reducing leakage of magnetic flux and amagnet-holding member for supporting this magnet on the claw magneticpoles are arranged on inside diameter faces of the claw magnetic poles.

[0024] As a result, it is possible to reduce leakage of magnetic fluxfrom inside diameter face of the claw magnetic poles and improve output.

BRIEF DESCRIPTION OF THE DRAWINGS

[0025]FIG. 1 is a sectional side view showing an electric rotatingmachine according to Embodiment 1 of the present invention.

[0026]FIG. 2 is a perspective view showing a rotor portion of anelectric rotating machine according to Embodiment 1 of the invention.

[0027]FIG. 3 is a front view of the rotor portion taken in the directionA of FIG. 1.

[0028]FIG. 4 is a perspective view showing a claw magnetic pole portion.

[0029]FIG. 5 is a sectional view in axial direction showing the clawmagnetic pole portion.

[0030]FIG. 6 is a sectional view in axial direction showing a clawmagnetic pole portion according to Embodiment 2 of the invention.

[0031]FIG. 7 is a perspective view showing a claw magnetic pole portionaccording to Embodiment 3 of the invention.

[0032]FIG. 8 is a perspective view showing a claw magnetic pole portionaccording to Embodiment 4 of the invention.

[0033]FIG. 9 is a perspective view showing a modified claw magnetic poleportion according to Embodiment 4 of the invention.

[0034]FIG. 10 is a sectional view in axial direction showing a clawmagnetic pole portion according to Embodiment 5 of the invention.

[0035]FIG. 11 is a sectional view in axial direction showing a modifiedclaw magnetic pole portion according to Embodiment 5 of the invention.

[0036]FIG. 12 is a perspective view showing a claw magnetic pole portionaccording to Embodiment 6 of the invention.

[0037]FIG. 13 is a front view showing a rotor portion according toEmbodiment 7 of the invention.

[0038]FIG. 14 is a sectional view in axial direction showing a clawmagnetic pole portion according to Embodiment 7 of the invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1

[0039]FIG. 1 is a sectional side view showing an electric rotatingmachine in its entirety such as ac generator or an electric motoraccording to one embodiment of the present invention. Referring to thedrawing, this electric rotating machine is provided with a housing 3comprised of a front bracket 1 and a rear bracket 2 both made ofaluminum, a shaft 6 disposed in this housing 3 and provided with apulley 4 fixed onto an end thereof, a Randell-type rotor 7 fixed ontothis shaft 6, fans 5 fixed onto both end faces of this rotor 7, a stator8 fixed onto an inner wall face in the housing 3, a slip ring 9 that isfixed to the other end of the shaft 6 and supplies the rotor 7 with acurrent, a pair of brushes 10 sliding on this slip ring 9, a brushholder 11 in which these brushes 10 are accommodated, a rectifier 12that is electrically connected to the stator 8 and rectifies analternating current generated in the stator 8 into a direct current, aheat sink 13 fitted to the brush holder 11, and a regulator 14 adheringto this heat sink 13 and regulating the alternating voltage generated inthe stator 8.

[0040] The rotor 7 is provided with a cylindrical rotor coil 15 forgenerating a magnetic flux by applying an electric current and a polecore 16 constructed so as to cover this rotor coil 15. Magnetic fluxgenerated by the rotor coil 15 forms a magnetic pole in the pole core16.

[0041] The stator 8 is provided with a stator core 17 and a stator coil18 wound round this stator core 17, and in which alternating current isgenerated by change in magnetic flux from the rotor coil 15 withrotation of the rotor 7.

[0042] The pole core 16 is comprised of a first pole core body 19 and asecond pole core body 20 engaging with each other and forming a pair.

[0043] The pole core body 19 and the pole core body 20 are normallycomposed of iron, each being comprised of a cylindrical part 19 a, 20 around which the rotor coil 15 is wound and a disk-shaped base part 19b,20 b from which the cylindrical part 19 a, 20 a protrudes.

[0044] The outer edges of the base parts 19 b, 20 b are provided withplural claw magnetic poles 21, 22 engaging with each other between theouter circumference of the rotor coil 15 and the inner circumference ofthe stator 8 respectively.

[0045] Each claw magnetic pole 21, 22 is formed so as to be thick andwide on the base part 19 b, 20 b side while gradually decreasing inthickness and width (tapered) toward the end side.

[0046] Inner circumferential face of each claw magnetic pole 21, 22gradually decreases in thickness toward the end thereof while outercircumferential face being arc-shaped extending along the innercircumferential face of the stator 8.

[0047] Each of claw magnetic poles 21, 22 has two trapezoidal side faceswith respect to the circumferential direction of the rotor 7.

[0048] The claw magnetic poles 21 and 22 are engaged with each otherwith their ends opposite to each other, and therefore slants of theinner circumferential faces of the claw magnetic poles 21, 22 arealternately arranged in the circumferential direction.

[0049] Side faces of the claw magnetic poles 21, 22 gradually decreasein width from the base side to the end side and inclines toward thecenter of the claw magnetic poles 21, 22.

[0050] Now, operation of the rotor is hereinafter described.

[0051] A battery not shown in the drawing supplies a current to therotor coil 15 through the brushes 10 and the slip ring 9 so as togenerate a magnetic flux. Thus, the claw magnetic poles 21 of the firstpole core body 19 are polarized with the N-pole, and the claw magneticpoles 22 of the second pole core body 20 are polarized with the S-pole.

[0052] On the other hand, the rotating force of engine drives the pulley4, the shaft 6 rotates the rotor 7, and, as a result, an electromotiveforce is generated in the stator coil 18.

[0053] This alternating electromotive force is rectified into a directcurrent through the rectifier 12 and the regulator 14 regulatesintensity thereof, whereby the battery is charged with the directcurrent.

[0054] On the other hand, it is possible to use the rotor as a motor byapplying a voltage to the respective ac terminals.

[0055]FIG. 2 is a perspective view showing a rotor portion, FIG. 3 is afront view of the rotor portion taken in the direction A of FIG. 2. FIG.4 is a perspective view showing one claw magnetic pole, and FIG. 5 is asectional view in axial direction of the claw magnetic pole.

[0056] As shown in the drawings, each claw magnetic pole 21 is providedwith one neodymium magnet 31, which is polarized so as to reduce leakageof magnetic flux from the inside diameter face of respective clawmagnetic poles 21, 22, on the inside diameter face of the claw magneticpole 21. Each claw magnetic pole 22 is also provided with one neodymiummagnet 31 on the inside diameter face of the claw magnetic pole 22.

[0057] A magnet-holding member 32 holds this magnet 31, and the magnet31 and the magnet-holding member 32 form a magnet assembly 33.

[0058] The magnet-holding member 32 is formed by bending a stainlesssteel (SUS304) plate of 0.5 mm in thickness, and is manufactured withease.

[0059] The magnet 31, as well as the inside diameter face of the clawmagnetic poles 21, 22, is trapezoidal plate-shaped, and themagnet-holding member 32 is fixed to the claw magnetic poles 21, 22 onboth side thereof.

[0060] The magnet assembly 33 is fixed to the claw magnetic poles 21, 22with an adhesive or the like.

[0061] Specifically, an adhesive or the like is applied between bothside faces of the claw magnetic poles 21, 22 and internal side faces ofthe magnet-holding member 32.

[0062] In a case where the claw magnetic poles 21, 22 and themagnet-holding member 32 are both made of metal, it is also preferableto fix the magnet-holding member 32 to the claw magnetic poles 21, 22 bywelding.

[0063] As described above, it is possible to reduce leakage of magneticflux from inside diameter faces of the claw magnetic poles 21, 22 byfitting the magnets 31, thereby improving output.

[0064] In addition, as the centrifugal force loaded on this magnet 31directly acts on the inside of the claw magnetic poles 21, 22, it is notnecessary for the magnet-holding member 32 to receive the centrifugalforce loaded on the magnet 31.

[0065] Therefore, it is not necessary that the magnet-holding member 32is so strong as the conventional magnet-holding member, and it ispossible to lighten the magnet-holding member 32 by, for example,cutting the side face parts of the magnet-holding member 32 to reducethickness thereof.

[0066] This makes it possible to relatively reduce weight applied on theclaw magnetic poles 21, 22 and restrain deformation caused bycentrifugal force.

[0067] As a result, it is possible to reduce the air gap between therotor 7 and the stator 8 and improve output of the electric rotatingmachine.

Embodiment 2

[0068]FIG. 6 is a sectional view in axial direction showing a clawmagnetic pole portion of an electric rotating machine according toEmbodiment 2 of the invention.

[0069] This embodiment differs from Embodiment 1 in the aspect that theneodymium magnet 31 is also trapezoidal in axial direction.

[0070] More specifically, the magnet assembly 33 is arranged so thatcenter of gravity of the magnet assembly 33 is located on the base parts19 b, 20 b of high rigidity at the portion nearer than the center of theclaw magnetic poles 21, 22, whereby end part of the claw magnetic poles21, 22 moving largely is reduced in weight.

[0071] When rotating the rotor 7 under the mentioned situation, the endpart of the claw magnetic poles 21, 22 moving largely, receivescentrifugal force less than in the conventional art, and the base partmoving less comes to receive centrifugal force more.

[0072] The claw magnetic poles 21, 22 are cantilevered and supported onthe base part, and therefore the centrifugal force on the end part isreduced. Thus it becomes possible to restrain movement of the end partand reduce air gap between the rotor 7 and the stator 8.

[0073] As a result, output of the electric rotating machine is improved.

Embodiment 3

[0074]FIG. 7 is a perspective view showing a claw magnetic pole portionof an electric rotating machine according to Embodiment 3 of theinvention.

[0075] In the foregoing Embodiment 2, the magnet assembly is constructedso as to cover the whole side of the claw magnetic poles 21,22 and,furthermore, center of gravity is located near the base side. In thisEmbodiment 3, however, not only center of gravity of the magnet assembly33 but also the magnet assembly 33 itself is diminished in size andformed on the base part side of the claw magnetic poles 21, 22.

[0076] In other words, the whole magnet assembly 33 is located on thebase parts 19 b, 20 b side.

[0077] By employing the construction described above, centrifugal forceon the claw magnetic poles 21, 22 increases only on the base parts 19 b,20 b side, and therefore the end of the claw magnetic poles 21, 22receives less centrifugal force, and movement of the claw magnetic poles21, 22 becomes small. As a result, the air gap between the rotor 7 andthe stator 8 is further reduced as compared with the foregoingEmbodiment 2, and therefore it is possible to increase output.

[0078] As described above, according to this embodiment, since themagnet assembly 33 is arranged so that not only center of gravity butalso external part of itself is located on the base parts 19 b, 20 bside of the claw magnetic poles 21, 22, centrifugal force on the clawmagnetic poles 21, 22 increases only on the base parts 19 b, 20 b sideof the highest rigidity in the magnetic pole.

[0079] As a result, the end part of the claw magnetic poles 21, 22 isless influenced by centrifugal force and moves less, and it is possibleto further reduce the air gap between the rotor 7 and the stator 8 andimprove output as compared with the foregoing Embodiment 2.

Embodiment 4

[0080]FIG. 8 is a perspective view showing a claw pole portion of anelectric rotating machine according to Embodiment 4 of the invention.

[0081] As shown in the drawing, the magnet-holding member 32 extends tothe side face of the base part 19b along both side faces of the clawmagnetic pole 21.

[0082] This extending portion is adhered to the claw magnetic pole 21with an adhesive agent or welded thereto for fixation.

[0083] As a result, the area in which the magnet-holding member 32 isfixed to the claw magnetic pole 21 is increased, and the magnet-holdingmember 32 is fixed more strongly than that in the foregoing embodiments.Furthermore, it is possible to restrain rotation in the circumferentialdirection of the rotor.

[0084]FIG. 9 is a perspective view showing a modification of the clawmagnetic pole portion. In this modification, the magnet assembly 33 isfixed to the claw magnetic pole 21 by joining the claw magnetic pole 21and the magnet assembly 33 on the area as large as possible, therebypreventing movement in axial direction.

[0085] Furthermore, any further process is not necessary for the clawmagnetic pole 21 itself, and therefore it is easy to design a magneticcircuit.

Embodiment 5

[0086] In this embodiment, the claw magnetic poles 21, 22 are providedwith any fixing part to which the magnet assembly 33 is fixed in axialdirection of the claw pole 21, 22. This construction makes it easy toprevent the magnet 31 from moving in axial direction and to decide theposition of the magnet 31 in assembling the rotor 7, and assemblingefficiency is improved.

[0087] By providing the magnet holding mechanism for preventing themagnet 31 from moving in axial direction, it is easy to prevent themagnet 31 from getting out due to vibration of the electric rotatingmachine.

[0088]FIG. 10 is a sectional view in axial direction showing the clawmagnetic pole portion of the electric rotating machine according toEmbodiment 5 of the invention. In this drawing, the claw pole 21 isprovided with a protrusion 34 at a part on the inside diameter side, andthis fixing part prevents the magnet 31, which prevents leakage ofmagnetic flux, from moving in axial direction. As a result, theprotrusion 34 not only prevents the magnet 31 from getting out in axialdirection but also acts as a guide for positioning at the time ofassembling, thus improving assembling efficiency.

[0089]FIG. 11 is a sectional view in axial direction showing amodification of the claw magnetic pole portion. In this drawing, a partof the magnet-holding member 32 extends, and an end of this extendingportion 32 a and the claw magnetic pole 21 are welded or joined togetherwith an adhesive or the like in order to fix the magnet 31 in axialdirection.

[0090] As a result, the magnet assembly 33 is more strongly fixed to theclaw magnetic pole 21, and it is possible to prevent the magnet 31 frommoving in axial direction.

[0091] According to the modification in FIG. 10, any further process isnot necessary for the claw magnetic poles 21, 22, and it is thereforepossible to apply a conventional magnetic circuit as it is at the timeof designing a magnetic circuit.

Embodiment 6

[0092]FIG. 12 is a perspective view showing a claw magnetic pole portionof an electric rotating machine according to Embodiment 6 of theinvention. In the drawing, the magnet-holding member 32 extends furtherup to the base part 19 b of the claw magnetic poles 21, 22, and is bentand fixed to the claw magnetic pole 21.

[0093] In this manner, the magnet-holding member 32 is constructed so asto embrace the claw magnetic pole 21 with both sides of themagnet-holding member 32 bent and joined together on backside of thepole.

[0094] As a result, the magnet-holding member 32 is strongly fixed tothe claw magnetic pole 21 with a fixing face located in axial direction,and it is therefore possible to prevent the magnet assembly 33 frommoving in axial direction.

[0095] Furthermore, since the portion where the magnet assembly 33 isfixed to the claw magnetic poles 21, 22 is located on the fixing face inaxial direction, it is possible to utilize elastic deformation of themagnet-holding member 32 at the time of fixing the magnet assembly 33 tothe pole cores 19, 20 in assembling and, consequently, assemblingefficiency is improved.

[0096] Thus, according to this embodiment, the magnet-holding member 32extends to the pole back face part and fitted to the claw magnetic poles21, 22, and both ends of the magnet-holding member 32 are joinedtogether on the backside of the pole.

[0097] By employing the construction described above, movement of themagnet 31 in axial direction is supported on the base parts 19 b, 20 bof the claw magnetic poles 21, 22, and therefore the magnet-holdingmember 32 is strongly fixed to the claw magnetic poles 21, 22 on the endface, and this facilitates the joining process for fixing themagnet-holding member 32 to the claw poles 21, 22.

Embodiment 7

[0098]FIG. 13 is a front view showing a rotor portion according toEmbodiment 7 of the invention, and FIG. 14 is a sectional view in axialdirection showing a claw magnetic pole portion. In the drawings,cylindrical ring 35 is fixed on the inside diameter side of the clawmagnetic poles 21, 22. Further, the magnet assembly 33 is press-fittedby the cylindrical ring 35 and, this cylindrical ring 35 supports theclaw magnetic poles 21, 22.

[0099] As a result, it is possible to press the magnet assembly 33 ontothe claw magnetic poles 21, 22 and strongly fix the magnet assembly 33.

[0100] In addition, the ring 35 is not always required to be cylindricalbut any other configuration is preferable as far as extending along theouter periphery of the claw poles magnetic 21, 22.

[0101] Although the foregoing Embodiments 1 to 7 show a rotor structureof a type in which a field coil is incorporated in the rotor and rotatesalong with the claw magnetic poles and a field current is supplied tothe field coil through a brush, the above-described construction is alsoapplicable to a brushless-type generator in which a field coil is fixedonto a bracket and a rotating field is supplied from the air gap.

What is claimed is:
 1. A rotor of an electric rotating machinecomprising: a rotor coil for generating magnetic flux by applying acurrent; and a pole core comprised of a first pole core body and asecond pole core body that are arranged so as to cover said rotor coil,each being provided with claw-shaped claw magnetic poles engaging witheach other; wherein a magnet assembly composed of a magnet for reducingleakage of magnetic flux and a magnet-holding member for supporting saidmagnet on said claw magnetic poles are arranged on inside diameter facesof said claw magnetic poles.
 2. A rotor of an electric rotating machinecomprising: a rotor coil for generating magnetic flux by applying acurrent; and a pole core comprised of a first pole core body and asecond pole core body that are arranged so as to cover said rotor coil,each being provided with claw-shaped claw magnetic poles engaging witheach other; wherein a magnet assembly composed of a magnet for reducingleakage of magnetic flux and a magnet-holding member for supporting saidmagnet on said claw magnetic poles are arranged on inside diameter facesof said claw magnetic poles, and said magnet assembly is formed so thatcenter of gravity of said magnet assembly is located on the base partside nearer than the center of said claw magnetic pole.
 3. A rotor of anelectric rotating machine comprising: a rotor coil for generatingmagnetic flux by applying a current; and a pole core comprised of afirst pole core body and a second pole core body that are arranged so asto cover said rotor coil, each being provided with claw-shaped clawmagnetic poles engaging with each other; wherein a magnet assemblycomposed of a magnet for reducing leakage of magnetic flux and amagnet-holding member for supporting said magnet on said claw magneticpoles are arranged on inside diameter faces of said claw magnetic poles,and said magnet assembly is entirely mounted on the base part side ofsaid claw magnetic pole.
 4. The rotor of an electric rotating machineaccording to claim 1, wherein said magnet-holding member extends to thebase part of said claw magnetic pole and is fitted to said claw magneticpole.
 5. The rotor of an electric rotating machine according to claim 2,wherein said magnet-holding member extends to the base part of said clawmagnetic pole and is fitted to said claw magnetic pole.
 6. The rotor ofan electric rotating machine according to claim 3, wherein saidmagnet-holding member extends to the base part of said claw magneticpole and is fitted to said claw magnetic pole.
 7. The rotor of anelectric rotating machine according to claim 1, wherein a fixing partfor preventing said magnet from moving in axial direction is provided onthe inside diameter side of said claw magnetic pole.
 8. The rotor of anelectric rotating machine according to claim 2, wherein a fixing partfor preventing said magnet from moving in axial direction is arranged onthe inside diameter side of said claw magnetic pole.
 9. The rotor of anelectric rotating machine according to claim 3, wherein a fixing partfor preventing said magnet from moving in axial direction is arranged onthe inside diameter side of said claw magnetic pole.
 10. The rotor of anelectric rotating machine according to claim 1, wherein an end of saidmagnet-holding member and said claw magnetic pole are joined together toprevent said magnet from moving in axial direction.
 11. The rotor of anelectric rotating machine according to claim 2, wherein an end of saidmagnet-holding member and said claw magnetic pole are joined together toprevent said magnet from moving in axial direction.
 12. The rotor of anelectric rotating machine according to claim 3, wherein an end of saidmagnet-holding member and said claw magnetic pole are joined together toprevent said magnet from moving in axial direction.
 13. The rotor of anelectric rotating machine according to claim 1, wherein saidmagnet-holding member extends to backside of the pole and is fitted tosaid claw magnetic pole, and two magnet-holding member are joinedtogether on said backside of the pole.
 14. The rotor of an electricrotating machine according to claim 2, wherein said magnet-holdingmember extends to backside of the pole and is fitted to said clawmagnetic pole, and two magnet-holding members are joined together onsaid backside of the pole.
 15. The rotor of an electric rotating machineaccording to claim 3, wherein said magnet-holding member extends tobackside of the pole and is fitted to said claw magnetic pole, and twomagnet-holding member are joined together on said backside of the pole.16. The rotor of an electric rotating machine according to claim 1,wherein a ring for press fitting said magnet assembly is provided on theinside diameter side of said claw magnetic poles.
 17. The rotor of anelectric rotating machine according to claim 2, wherein a ring for pressfitting said magnet assembly is provided on the inside diameter side ofsaid claw magnetic poles.
 18. The rotor of an electric rotating machineaccording to claim 3, wherein a ring for press fitting said magnetassembly is provided on the inside diameter side of said claw magneticpoles.